Attachment-plug for electric circuits.



P. H. CHAPMAN & 0. E. KENNEY. ATTACHMENT PLUG FOR ELETRI URCUITS.

APPLICATION :um 1113.24. 1911!.

, 1,080,325. Ptentgd Dm. 2, 1913,

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Aber emboc vingl our invention.

i facture and tOeiibance-the f *UNITED STATES PATENT OFFICE.

y NEY, OF TOLEDO, OHIO. ASSIGNORS TO THE YOST `EILEO'JIIRIC MANUFACTURING COMPANY. OF TOLEDO. OHIO, A CORPORATION FRANK H. CHAPMAN' AND ovvi-ui KEN the county of Lucas and State ot Ohio. have i invented a certain'ncw and useful Attacbnient-Flingi t'or `Electric Circuits; and we do hereby declare the followingii to be :i full,

clear, and exact description of the invention7 suchas will enable others skilled in the art to which it appertains to make and use the samejreference being' had to the accompanying drawings, and to the characters` of reference marked thereon, which torni a part of this specification.

This invention relates .to electrical devices, and particularly to the plug' members of the quick connecting type of plug and socket couplings for electric circuits. but is not restricted to suchuse as it may be used in anyconnection for .which it may be adapted or` appropriate.

The object `ot'iour invention is to'improve 'fu )on-the construction of the plug members otcircuit connecting devices of this characterwhereby'to cheapen the cost ot' manuy practicability and commercial .i value1l thereof.

The invention .-'is'ifully described in the 'following, specification, and while, in its broader aspect, it is capableof embodiment ,in numerous forms` a preferred embodiment thereof'is illustrated in. the accompanying drawing7 4in which Figure l 'is aside elevation of a plug mem- Fig. 2 is a l is view of thecontact end thereof. Fig'. o

`an elevation of ay plug member partly inserted in a socket member with parts oft each Fig. 4 1s a member different 'from the section shown in Fig. 3, and Fles. 5 and G are side and inner end views, respectively, of the plunger part vot the plug., i l l y v Referring tothe drawings, A designates- `the socket member `of the4 coupling,` which "mmberis vof customaryor yany suitable constructioin and hasthefcentral contactpai't fing'Q-forming the other contact of the socket.

1 .and the spirallyygrooved or threaded lin- The plug member B of the coupling, in

.1 which memberfthe featuresof our invention reside,4 comprises the body part 3 and the i i Specification of Letters Patent.

ATTACHMENT-PLUG FOR ELECTRIC CIRCUITS.

Patented Dec. 2,1913.

Application filed February 24. 1913. Serial No. 750,299.

phiiiger part 1t, which latter is mounted for axial recipi'ctatory movements in a longitudinally extending'socket 5 in one end of the. body part: 3f A coiled compression spi-inni (i is disposed in the base of the socket 5 and acts against the plunger 4 to cause its outer end to be yicldingly projected a short distance without the open end of the, socket as shown, such distance being normally limited by a spring catch 7, Which is carried by the'plunger 4 in a recess 7 at onev side thereot` and engages` in a registering;` socket or opening 8 in the wall of the socket 5. The catch 7 has a beveled surface to per mit its depression by Contact with the wall of the socketI 5 when the plunger isbeing inserted into position within such socket and to enable the plunger to have inward depressing' movements from its normal posi-` tion in thc socket 5 should the opening 8 not be of suliicieiit length for the catch to'frnove lreeli1 therein during such depressing movement. To remove the plunger from the socket 5 1t is only necessary to insert a`pin,`

-or the pointed end of some other suitable instrument, into the opening 8 and tombear iliward therewith against the catch' 7 to `depress the same trom within the opening 8,

jacent to its outer end. with a raisedboss orv radially projecting.r part 9 and has a recess i l0 extendingr 'from the inner sidcofsucb boss to the iniierend ot' the plunger. Acondiictor-strip l1 is mounted within the baser portion of the recess` l0. beingr secured therein. in the present instance. by a'screw "l2, and'has its outcr end portion ott'set` and exltendiiig over the bess 9 tti-provide a contact 'face 123 therefor. The combined depth .of

the boss 9 and contact part 13 issiitticient.

to project through a registering notch or opening lt in the outer end portion oi the wall of? the socket 5, and preterably a .shortA distance beyond the outer peripheral surface oi such wall to insure contact Aofthe part.'

` 5% with the lining Q of the socket mciiiberA when the plug member is inserted in said .socket member. A and contact part 13 through the opening 14 also serves to guide the reciprocatory move- Tbc working of the boss 9l ments of the plungeil in the plug body 3 l and toinsure the proper assembling ofthev plug parts.-

One` of the ,lead-in wires 15, 1G, which enter the base portion of the socket 5 thro-ugh an opening 17 in the outer end of the body part 3 of the plug member, extends into the recess of the plunger over the contact strip 1.1 and is clamped to the latter by a binding screw 1S. The other lead-in Wire is projected, in the present instance, through a longitudinal passage -19 in the plunger and has its free end engaged to a contact screw or part 20 which `is disposed centrally of the outer end of the plunger in position to have contact with the contact part l o f the socket member A. when the plug member is inserted therein, as shown in Fig. 3.

If desired the outer end portion of the vbody part 3 of the plug member may have a ferrule 21 of metal or other suitable material fitted therearound to provide a smooth wearing surface for contact with the lining the socket member A. This ferrule is not intended, however, to form any part of the electric circuit as the electrical contact between the plug member and the lining 2 of the socket is through the contact pai-t 13 with which one of the lead-iii wires 15, 16 is connected. The ferrule 2,1has openings'or notches therein iii register with the notch let and opening 20 of the body part 3 of the plug member.

The means employed, in the present instance, for securing the members A and B of the coupling together, when inserted one within the other. comprises a ball or locking part 22, which is mount-ed in an opening in the wall of the plug socket 5 and is adapt ed to have its inner end project within'tlie socket 5 and to work in a registering long itudinal groove or channel 23 iii the plunger- 5 `when the outer side of the ball or part 22 is substantially flush with the outer periphery of the socket wall. lVhen the plug member is forced into the socket member and the contact end of the plunger 4 has contact with the part 1 of the socket member, said plunger is depressed within the socket 5 of the plug and a raised surface 211 at the outer end of the groove 23 moves into' contact with the ball or part 22 and forces it outward into engagement with a register ing spiral groove in the lining 2 of the socket member. The imparting of a slight turning movement in clockwise direction to the plug member B after the part 22 has been projected into thread engaging posi-v tion .causes a tightening together of the coupling members. The raised surface 24 is referably composed of metal or other hard surface to prevent a wearing of said surface when the part 22is in thrust contact therewith. It is evident with this form of l meegaat coupling that the' twocontact parts 11 and -20 of the plug member are carried by the plunger 4 of such member for movements therewith, and that the closing of tliecircuit through the coupling members is not dependent upon the making of contact with the socket lining 2 by a part carried by the body 3 of the plug orby the retaining parts v which serve to couple the two members of the'coupling together. It is preferable in theassembling /of the plugl members to dispose the coupling means 22-24 at the opposite 'side o-f the plug to the contact part 11 so that the outward forcing of the coupling part 22 into engagement with the socket lining 2 will effect a forced Contact of the part 11 with such lining.

lVe wish it understood that our invention is not'limited to any specific construction or arrangement of thel parts except in so far as such limitations are specified in the claims.

Having thus described our invention,

what we claim as new and desire to secure by Let-ters Patent, is-

1. A coupling for helectric circuits comprising a socket member having separate contact parts and a plug member, said plug member having two sections which ai'e rela.- tivelv movable upon an insertion' thereof iiitothe 'socket member, one of said sections carrying a pair of contact parts for contact with the respect-ive Contact parts of the socket member when inserted therein, and means separate from said contact parts and automatically operable by a relative movenient of the plug member sections when inserted within the socket member to hold the two members in coupled relation.

2. A coupling for electric circuits com. prising a socketv memberhaving separate contact paar-ts and a plug member, said plug member having sections which are relatively movable upon an insertion of the -plug apredetermined extent into the socket member, contacts carried by the plug `member for contact. with the respect-ive contact parts of the socket member when the plug'is in.l serted ltherein, and means .separate from said contact parts and automatically -operable by a relative movement of the plug sections when inserted into the socket member to hold the two members in coupled relation.

3; in a coupling of the class described, a plug member having a socketed portion and a plunger mounted in said socketed portion, a conductor element having a portion countersunk in the plunger and a portion which is radially otlset relative to the plunger to forni a contact partfor side contact with thewall of a socket member into which the plug may be inserted.

4. In a coupling of the class described, a plug member having a socketed body part with a recess in the outer end portion ot the socket: Wall, a plunger longitudinally morable in Said socket, :1 contact part fixed to 'said plunger and prop-acting?r through said recess and a. separate contact part carried by said plunger.

5. ln a couliling ot' the Clasl described, a plug having a body member provided with an end socket and havingan opening' in the wall ot` such socken' a plunger mounted 'for reeiproeatory movements in said socket. mea-ns influencing an outward movenurnt of the plunger relative to the socket and Spring cnteh means carried by the plunger Jf'or engagement with said opening to limit the normal outward movements ot' the plunger relative, to the :sockety and adapted to be depressed from within Said opening by the insertion of an instrumentfinto the latter.

6. In a. coupling of the class described, a socket member having base and wall contacts Within the` socket thereof, a plug member having two telescoping portions mounted for relative axial movements,means influencing an outward movement of said portions? a contact part fixedly carried by the inner of said portions and working radially therefrom through a part of the other portion to adapt it to have Contact, with the wall Contact of said socket, a second contact part carried by the inner one ot' Said portions t'or enpffngelnentI with the base contact part of said socket, and means carried bv the plut?r member and operable by a relative movement of the portions thereot to cooperate willi the socket wall to hold the members in coupled relation when the plug' member has been inserted a predetermined distance into the socket member.

ln testimony whereof, we have hereunto signed our names to tliiaI Slwcifieation in the presence of two subscribing witnessesi FRANK H. CHAPMAN. OWI'LN E. KENNEY.

Witnesses:

Faun Pannelli, Ina Riemer. 

